Being on the road, I listen to a lot of podcasts to keep my mind busy and not fall asleep. In the past, I only had two or three, but recently I listened to all of them and came across a lot more interesting  ones. Fitting in with my interests, they are more business, pickup, etc. related.

http://www.buddhistgeeks.com/They interview a lot of interesting people including scientists, researchers, spiritual teachers, and what not. None of the New Age type bullshit, but you probably need at least a remote interest in Buddhism, mindfulness, or meditation to care. Anywhere from 15 minutes to 1 hr, usually longer on the recent ones

http://www.daygame.com/podcast/UK guys that just talk about day game. I think there's a lot of fluff, but it does get me socially motivated to meet new people which is good when I'm visiting a new city where I know no one. They have an emphasis on honest, direct game which I like. Around a hour each.

http://radiolab.org/I've listened to every single one of their episodes. Usually they choose a broad topic or questions like Bad Guys or Colors or Guts and try to find the answer and tell a lot of antecdotes along the way. You will be entertained. And I've been unknowingly retelling the stories because they're so good. About a hour.

http://ecorner.stanford.edu/podcasts.htmlI just found this recently and only listened to two of them but boy were they really really good. Stanford Univ's Entrepeneur Center interviewing CEOs and entrepeneurs with Q&A at the end